Some of the similarities include the inability to get justice from the courts, and the way local civil authorities act as enemies rather than protectors. Also, while we tend to focus on the intellectual superstars we produced in Europe, shtelt Jews were very much an underclass, with all that entails. Hitler didn't have to work very hard to convince white Europeans that we were a sort of subhuman. The idea was already firmly rooted in the European consciousness. I don't think its much of a stretch to say that black - especially third and fourth generation American blacks - are likewise viewed by many as something of a inferior species.
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